Well "forked again" what u say is partly correct but partly wrong...
No chess player can play games with 100% control every time Not even MAGNUS CARLSON ,at least 1 time a player would do a blunder or a mistake or even a inaccurate move and turn the whole game upside down....It is because we are human ...There are only a few perfect brains in this world...
So at least a few times our games are based on luck...You say that if we play chess while analyzing,calculating ,and by playing correct moves you can win a game and that you do not need luck...but what happens when your opponent does the same there is NO END TO A GAME WITHOUT EVEN A SMALL MISTAKE.....
Again you are right and I am right we are just defining luck differently. A lesser player beats a stronger player one day. His overall skill did not become better than the stronger player, but on that day he played better, that's all. I don't call that luck that he just raised his level of performance.
Say there is a super hard expert ski run that I can not ski down accurately. I go slow and I fall a lot. Then one day I have a great performance, don't fall, and get down in half my normal time. I don't think that's luck. I did it myself. There was no outside force acting as a random factor that helped me.
Indeed To paraphrase Capablanca, "Luck always follows the better player"
I say: to use the term 'always' is almost...ahem...always a trap.
Hey, Magnus is the best player on the planet, yes? But some MUCH weaker players have beaten or held him to a draw in the past few years.
Usually, that is because of Magnus' ego...going all out, taking sometimes better (but not 'won') sometimes not better (but drawable) positions, taking chances because his ego tells him he is supposed to be so much better than these 'average GM's and thus win.
If you happen to be one of those average GM's on that given day, you my friend are the benefit of some luck in your individual game with Magnus. Congratulations!